Yellow pyrazolone mono azo dyestuffs



Patented Sept. 13, 1932 WEED, mm:

.IVIANY, ASSIGNORS 'IO GENERAL ANILINE VJOEKS, INCL, OF NEW YORK, N. Y., LA

' CORPORATION OF DELAWARE YELLOW rYnAzoLoNE MONO .AZOZDYESTUFFS No Drawing. Application-filed September 12, 1929, Serial No; 392,250, and. in Germany September 21, 1928.

Our present invention relates to yellow pyrazolone mono azo dyestuffs.

In U. S. Patent Specification No. 965,882 a process of preparing yellow wool dyestuffs. is described which consists in causing the diazo compounds of aminoaryl sulfonamides, wherein the sulfur of the sulf-onamide-residue is attached to a carbon atom of the aryl residue, for instance, of a benzene or naphthalene 0 nucleus, respectively, containing the amino group, andiderivatives thereof to act upon pyrazolones or their substitution products and, if desired, sulfonating the dyestuffs thus obtained. V g 7 Now we have found that'dyestufis are obtained which in comparison with those described in the above mentioned U;- S.- patent specification have an increased fastness to light, when coupling diazo compounds of bases having the following general formula:-

introducing halogen atoms thefastness to light of the above named dyestuifs would be increased was unknown. In U. 3. Patent Specification No. 965,882 halogenated arylpyrazolones are not mentioned.

The dyestuffs obtainable according to ,the.

5 present invention are characterized by the following probable general formula: V 3

nOz-e-Nfl aryl i 1 v wherein aryl represents an aryl residue the hydrogen atoms of which may be substituted by alkyl, alkoxy or haloge"11 ,Y stands for the groups (011 COO alkyl-i or a carboxyl larly by the following probable formula:

1 (2 chloro-eF-sulfophenyl) -3-methyl-5-py razolone in thepresence of an excess of sodium carbonate. The dyestufi" thus formed is precipitated by means of sodium, chloride and filtered; it represents when being'dried a yellow powder and dyes wool greenishyellow tints of very good fastness to light. By using instead of the pyrazolone mentioned in this example the 1- (4J-chloro-5 -methyl-2 sulfophenyl)-3-methy1-5-pyrazolone or the 1-; (2 chloro-5-sulfophenyl) -3-methyl-5-pyrazolone,'a dyestuf'f dyeing similar tints and having similar fastness properties is obtained,

(2) 24.8 parts of meta-aminobenzene-sulfonic acid-phenylamide are diazotized as indicated in Example 1 and coupled with 31 parts of the sodiumsalt of the 1-(2-chloro- 5-sulfophenyl) g-methybo-pyrazolone in'the presence of an excess of sodium carbonate. The dyestuff thus obtained is precipitated by means of the sodium chloride, filtered and represents when being dried a yellow powder. "It dyes wool greenish-yellow tintsof very good fastness to light.

When using instead of the pyrazolone mentioned in this example other pyrazolones such, for instance, as those mentioned in Exnew omen.

' rrnmz EICHWEDE'AND :rosnr nnc'n'on, or FRANKFORT-ON-TI-IE-MAIN-HOCHST, GER,

group and'X for a sulfo group, more partiou-l: 1"

as; i

ample 1, there are likewise obtained dyestuffs dyeing wool greenish-yellow tints and having an excellent fastness to light.

(3) 24.8 parts of meta-aminobenzene-sulfonic acid-phenylamide are diazotized as indicated in Example 1 and coupled with 33 parts of the sodium salt of the 1-(2'.5'-dichloro-4-sulfophenyl)-3-1nethyl pyrazolone in the presence of an excess of sodium carbonate. The dyestuff thus obtained is precipitated by means of sodium chloride and represents when being dried a yellow powder. It dyes wool greenish-yellow tints of very good fastness to light.

The following bases: meta-aminobenzenesulfonio acid-phenylamide, l-methyl-t-aminobenzene-Q-sulfonic acid-phenylamide, 1-

methyl 4 aminobenzene 4 2 sulfonic acir-or tho-.tolylamide, and many other bases can be combined in any manner with the following pyrazolones 1- (2 chloro-5-sulfophenyl) -3- methyl-5-pyrazolone, 1'- (2-chloro 4-sulfophenyl) -3-methyl-5-pyrazolone, 1- (4:-chloro- 2'-sulfophenyl) -3-meth'yl-5-pyrazolone, 1-4- chloro-5-methyl-2-sulfophenyl) -3 methyl- 5-pyrazolone, 1 (2. 5-dichloro-4-sulfoph enyl) -3-methyl-5-pyrazolone, 1-(4-chloro-3- sulfophenyl) -5-pyrazolone-3-carboxylic acid, 1- (2-chloro-5 -sulfophenyl) 5 -pyrazolone- 3-carboxylic acid ester etc. to dyestuffs of the above mentioned kind. 1

The present invention, however, is not limited to the preparation of dyestuffs obtainable from the above mentioned substances. We claim:

' 1. As new products, the azo dyestuffs of the following probable general formula:

I g z SOs-NEH X R stands for a benzene residue which may be substituted by alkyl, 7

Z for CH -group, a chlorine-or hydrogen atom and X for asulfo group, the said dyestuffs having a yellow color and being distinguished by their fastness to light.

7 light.

or a carb oxyl 3. As new products, the azo dyesuifs of the following probable general formula:

SO2.NH. OeHs wherein X stands for a sulfo group in 1- or 5-position and v s for a GIL-group or hydrogen,

the said dyestufls having a yellow color and being distinguished by their fastness to light. 5. As new products, the azo dyestuffs ofv the following probable general formula:

| N SQNMM/ ll V 0 801011 wherein 8 stands for a CH -group or hydrogen, the said dyestufi's having a yellow color and being distinguished by their fastness to 6. As new products, the azo dyestuffs of the following probable general wherein Z stands for a GIL-group, a chlorine or hydrogen attom. X for a sulfo group, the said dyestuffs having a yellow color and being distinguished by their fastness to light. 7 V

7 As new products, the azo dyestuffs of the following probable general formula:

S 0:.NH. CsHi wherein X stands for a sulfo groupin 4 or 5-position, the. said dyestuffs having a yel-' formula g lit low color and being distinguished by their fastness to light. I

8. As a new product, the azo dyestufi' of the following probable formula:

0 V SOiOH the said dyestufi'having a yellow color and being distinguished by its fastness to light.v

In testimony whereof, we aifix our signa tures. HEINZ' EICHWEDE.

J OSEF RACHOR. 

